Finding the Fourth Proportional to 2,488.18, 3,728.94 and 1,186.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,488.18 : 3,728.94 = 1,186.78 : x
2. Step 2: Convert to fraction form
   2,488.18/3,728.94 = 1,186.78/x
3. Step 3: Cross multiply
   2,488.18x = 3,728.94 × 1,186.78
4. Step 4: Simplify right side
   2,488.18x = 4,425,431.41
5. Step 5: Solve for x
   x = 4,425,431.41/2,488.18
6. Step 6: Final answer
   x = 1,778.58